Abstract: A method useful in the continuous ore extraction in underground works intended for the permanent production of extraction from draw points or trenches, comprising the construction of reduced size drifts (4) wherein through the center defined by a group of drifts crosses a drift (2) which is intended for ore haulage, such drift crosses successively all drift groups defined at the exploitation face,—such extraction points (11) are arranged to form a regular layout [m4] at certain distances which are compatible with an interactive gravitational flow; once such drifts, trenches and haulage drifts are constructed the pre-conditioning, caving and extraction stages are carried out.

Abstract: Method intended to unblock enriched air blow or reaction gases nozzles in reactors or fusion converters for mining industry pyrometallurgy CHARACTERIZED by the injection of discrete air impacts with time intervals regulated to high pressure and rate through the enriched air blow or reaction gases nozzles; thus, the air impacts penetrate into the melting bath of such reactors or converters, producing the breaking of blocking accretions that dug the flow of such a enriched air or gas through the nozzle and forming, because the cooling provoked by the penetration of them, a directed accretion with material of the melting bath which is solidified by the cooling effect, allowing that the production of directed accretion be a natural lengthening of the tube of nozzle from the inner wall of these reactors or converters, and by this way to allow that the O2-enriched air blowing through the nozzle enters deeper in the melting bath, to a distance where breaking waves of this flow are generated far of the wall that has

Abstract: A nut cold cutter devise is used in the assembly and maintenance of semi-autogenous grinding mills for large-scale mining. The device includes a front body, a back body and a hydraulic cylindrical chamber located between the front and back bodies. The front body has a defined cavity in which there is a movable cutting tool and a fixed cutting tool. The nut to-be-cut is positioned in the space located between the two cutting tools. The hydraulic cylindrical chamber contains a push piston that is sealed to the inside of said hydraulic cylindrical chamber with watertight joints. The push piston is attached to a toolholder axis and the movable cutting tool is attached to the front end of the toolholder axis.